3rd-9 7W Energy Physics Newton

Classroom Rules

Green Light: Go time! The lesson is being
taught and the classroom will be on task
with the lesson. 100% Focused. No talking
and do your best to be on task.

Yellow Light: Cautiously thinking. Raising
our hands to ask questions. Classroom
discourse allowed.

Red Light: Classroom activity stops.
Any issue will be dealt with. Any
talking or disruptive behavior will
result in possible loss of recess time,
loss of free time, e-mailing parents,
and/or other corrections.

Classroom Rules

All lights off : Free
time to work on
other school work
and get ready for
the next class.

Be on the lookout for the
Cardinals.

If you call out a
Cardinal and there
isn’t one on the
screen you will have to
stand and answer a
random science
question.

GOLD LETTER notes

Isaac Newton was a genius scientist who figured out some really important things about how the world works. He thought a lot about why things move and stay still.

Have you ever wondered why your toy stops moving when you stop pushing it? Or why an apple falls from a tree to the ground? Well, Newton thought about these things too!

​

Who is Isaac Newton

One of the big ideas he came up with is called the "3 laws of motion."

The first law says an object in motion will stay in motion and an object at rest will stay at rest unless acted by an outside force.

It's a bit like how this ball behaves – The ball does not like to change what it's doing unless you do something to it.

​

So, Newton's First Law is like telling us that things like to keep doing what they're already doing - staying still or moving - and they don't like changing by themselves.

​

​Newton's 1st Law

F=ma

The Force is equal to the mass X acceleration.

​

​Newton's 2nd Law

Imagine you have two toy cars. One is big and heavy, and the other is small and light. Now, if you give both cars the same little push, which one do you think will go faster?

​

Newtons's 2nd Law

Newton's Second Law says the speed of a toy car (or anything!) depends on two things: how hard you push (force) and how heavy the car is (mass).

So, if you push the big, heavy car and the small, light car with the same force, the small one will zoom away faster because it's lighter.

Here's a simple example to illustrate this:

Let's say you have a car with a mass of 1000 kilograms (m), and it is accelerating at a rate of 2 m/s22m/s2 (a). To find the force (F) acting on the car, you can use Newton's second law:

F=ma

F=(1000 kg)(2 m/s2)
F=(1000kg)(2m/s2)

F=2000 N

​

Newton's 2nd law also tells us that if the force is increased and the mass stays the same the acceleration will increase.


F=ma

​

For every action, there is an equal and opposite reaction

In other words, if object A exerts a force on object B, then object B simultaneously exerts a force of equal magnitude in the opposite direction on object A.

​Newton's 3rd Law

Imagine you and your friend each have a big, squishy balloon. If you both push your balloons toward each other, what happens?

Every push has a pull, and every pull has a push! It's like a game of tug-of-war with invisible ropes.

​Newton's 3rd Law

The rocket and balloon in these gifs are pushing gases downward, the gases are, in turn, exerting an equal and opposite force upward on the rocket or balloon. This upward force is what propels the rocket or balloon into the air.

​

​Newton's 3rd Law